/*
 * Copyright 2009-2010 Original Author(s)
 * 
 * This file is part of Kommando
 * 
 * Kommando is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Kommando is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Kommando.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kommando.textfile.objectsource;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.swing.Icon;

import org.kommando.core.catalog.AbstractObjectSource;
import org.kommando.core.catalog.CatalogObject;
import org.kommando.core.catalog.ObjectSource;
import org.kommando.core.catalog.SimpleCatalogObject;
import org.kommando.filesystem.core.FileObject;

/**
 * {@link ObjectSource} that shows the lines of a textfile as its children.
 * 
 * @author Peter De Bruycker
 */
public class TextFileObjectSource extends AbstractObjectSource {

    private static final String ID = "filesystem:textfile";

    @Override
    public List<CatalogObject> getChildren(CatalogObject object) {
        TextFileObject textFileObject = object.getExtension(TextFileObject.class);

        try {
            TextLines textLines = textFileObject.getLines();

            List<CatalogObject> lines = new ArrayList<CatalogObject>();

            for (TextLine line : textLines.getLines()) {
                // TODO determine id of textline (file:text:<file path>:<line>)?
                SimpleCatalogObject lineCatalogObject = new SimpleCatalogObject(line.getText(), line.getText(), line.getText());
                lineCatalogObject.setExtension(TextLine.class, line);
                lineCatalogObject.setExtension(String.class, line.getText());

                lines.add(lineCatalogObject);
            }

            return lines;
        } catch (IOException e) {
            // TODO handle exception
            e.printStackTrace();
        }

        return null;
    }

    @Override
    public boolean hasChildren(CatalogObject object) {
        return object.hasExtension(TextFileObject.class);
    }

    @Override
    public String getId() {
        return ID;
    }

    @Override
    public String getDescription() {
        return "Loads the lines of a text file";
    }

    @Override
    public Icon getIcon() {
        // TODO icon
        return null;
    }

    @Override
    public String getName() {
        return "Text Lines";
    }

    @Override
    public Class<?>[] getExtensionTypes(CatalogObject object) {
        if (object.hasExtension(FileObject.class) && !object.hasExtension(TextFileObject.class)) {
            return new Class<?>[] { TextFileObject.class };
        }

        return null;
    }

    @Override
    public <T> T getExtension(CatalogObject object, Class<T> extensionType) {
        if (TextFileObject.class.equals(extensionType)) {
            // don't read it yet. we'll read the file when the children are fetched
            return extensionType.cast(new TextFileObject(object.getExtension(FileObject.class).getFile()));
        }

        return null;
    }

}
